Prestige.
If you can comand £25 p/hour for build cleaning in your area - good on ya!
And I think 10 hours for a flat is a bit slow going.
I can do an average 3 storey 4 bed townhouse in just under 8 hours.
(Including windows - inside and out!)
If Mathew takes your advice (and completes in say 6 hours per/flat) he will be asking for £38 p/hour to get his £230!
A more realistic amount would be around £15 - £20 p/hour average across the country. (= £90 to £120 per flat)
Tim, he didn't ask for a sparkle price, only build clean.
If he gets the contract (doubtful) he will post on here later for the sparkle price, I'm sure.
To save him the trouble, about £50 per flat - and include a plug-in air freshener for each flat!
Mathew, let us know what you settled on asking for - and if you got the contract!